1.查询hr用户下的EMPLOYEES表，根据输入的first_name，查询拥有相同first_name的雇员信息。 （1）如果没有此first_name，应给出提示。 （2）如果只有1个first_name，应给出提示。 （3）如果有多个first_name相同用户，显示重名的总人数及他们的最高工资。
1.查询hr用户下的EMPLOYEES表，根据输入的first_name，查询拥有相同first_name的雇员信息。 （1）如果没有此first_name，应给出提示。 （2）如果只有1个first_name，应给出提示。 （3）如果有多个first_name相同用户，显示重名的总人数及他们的最高工资。
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